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Related Experiment Video

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Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro
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Short-term HFD does not alter lipolytic function of adipocytes.

Michael Sf Wiedemann1, Stephan Wueest2, Alexandra Grob3

  • 1Division of Pediatric Endocrinology and Diabetology; University Children's Hospital; Zurich, Switzerland ; Children's Research Center; University Children's Hospital; Zurich, Switzerland ; Zurich Center for Integrative Human Physiology; University of Zurich; Zurich, Switzerland.

Adipocyte
|April 11, 2014
PubMed
Summary

A short high-fat diet (HFD) does not alter fat cell lipolysis. Increased circulating free fatty acids (FFA) in HFD-fed mice may stem from increased dietary fat intake, not impaired fat breakdown.

Keywords:
adipose tissue–liver crosstalkdiabetes mellitusfat depotlipolysislipotoxicity

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Area of Science:

  • Metabolic disease research
  • Adipose tissue biology
  • Hepatic insulin resistance

Background:

  • High-fat diets (HFD) rapidly impair glucose tolerance and liver insulin sensitivity.
  • Adipose tissue inflammation and disrupted liver cross-talk are early drivers of HFD-induced hepatic insulin resistance.
  • Previous studies showed Fas/CD95 depletion in white adipose tissue (WAT) protected against hepatic insulin resistance but not steatosis.

Purpose of the Study:

  • To investigate the impact of a short-term HFD on adipocyte lipolytic activity.
  • To determine if HFD affects basal, stimulated, or insulin-suppressed lipolysis in isolated adipocytes.
  • To correlate adipocyte lipolysis with circulating free fatty acid (FFA) levels.

Main Methods:

  • Isolated adipocytes from chow-fed and HFD-fed mice were used.
  • Basal and isoproterenol-stimulated lipolysis were measured by free fatty acid (FFA) and glycerol release.
  • Insulin's effect on suppressing lipolysis was assessed.

Main Results:

  • Lipolytic activity (basal and stimulated FFA/glycerol release) was similar in adipocytes from chow and HFD-fed mice.
  • Insulin effectively suppressed lipolysis in adipocytes from both groups, indicating retained insulin sensitivity.
  • Circulating FFA levels were elevated in non-fasted HFD-fed mice despite unchanged adipocyte lipolysis.

Conclusions:

  • Short-term HFD exposure does not impair the intrinsic lipolytic function of adipocytes.
  • Elevated circulating FFA in HFD-fed mice may be attributed to increased dietary fat absorption rather than altered fat cell lipolysis.
  • Adipocyte lipolysis is not the primary cause of increased circulating FFAs during short-term HFD challenges.